More vastness amusement:

The SNES' audio processing unit ( en.wikipedia.org/wiki/Nintendo ) holds 64KB of RAM for storing sample data, the echo buffer, and such.

An SPC file is essentially just a small metadata chunk tacked onto a memory dump of that RAM. This means that every SPC is 64KB plus a tiny bit. Within a single game's soundtrack, most of that data is repeated in each track, so it compresses well.

The 7Zip archives take up 173MB.
Unpacked, these total well over 2GB.

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